Nonaqueous electrolyte secondary battery

Abstract

A nonaqueous electrolyte secondary battery including a positive electrode containing a positive electrode active material, a negative electrode containing a carbon material as a negative electrode active material, and a nonaqueous electrolyte containing a solvent and a solute wherein sulfolane is included in the nonaqueous electrolyte as a solvent and vinyl ethylene carbonate and vinylene carbonate or a derivative of the vinylene carbonate are added to the nonaqueous electrolyte.

What is claimed is:  
     
         1 . A nonaqueous electrolyte secondary battery comprising a positive electrode including a positive electrode active material, a negative electrode including a carbon material as a negative electrode active material and a nonaqueous electrolyte including a solvent and a solute, wherein sulfolane is contained as a solvent in the nonaqueous electrolyte and vinyl ethylene carbonate and vinylene carbonate or a derivative of vinylene carbonate are added to the nonaqueous electrolyte.  
     
     
         2 . The nonaqueous electrolyte secondary battery according to  claim 1 , wherein sulfolane is contained in an amount of at least 15% by volume, on the basis of the total volume of the solvent.  
     
     
         3 . The nonaqueous electrolyte secondary battery according to  claim 1 , wherein the amount of vinyl ethylene carbonate added to the nonaqueous electrolyte is in a range of 0.1˜5 parts by weight per 100 parts by weight of the nonaqueous electrolyte.  
     
     
         4 . The nonaqueous electrolyte secondary battery according to  claim 2 , wherein the amount of vinyl ethylene carbonate added to the nonaqueous electrolyte is in a range of 0.1˜5 parts by weight per 100 parts by weight of the nonaqueous electrolyte.  
     
     
         5 . The nonaqueous electrolyte secondary battery according to  claim 1 , wherein the amount of vinylene carbonate or a derivative thereof added to the nonaqueous electrolyte is in a range of 0.1˜5 parts by weight per 100 parts by weight of the nonaqueous electrolyte.  
     
     
         6 . The nonaqueous electrolyte secondary battery according to  claim 2 , wherein the amount of vinylene carbonate or a derivative thereof added to the nonaqueous electrolyte is in a range of 0.1˜5 parts by weight per 100 parts by weight of the nonaqueous electrolyte.  
     
     
         7 . The nonaqueous electrolyte secondary battery according to  claim 3 , wherein the amount of vinylene carbonate or a derivative thereof added to the nonaqueous electrolyte is in a range of 0.1˜5 parts by weight per 100 parts by weight of the nonaqueous electrolyte.  
     
     
         8 . The nonaqueous electrolyte secondary battery according to  claim 4 , wherein the amount of vinylene carbonate or a derivative thereof added to the nonaqueous electrolyte is in a range of 0.1˜5 parts by weight per 100 parts by weight of the nonaqueous electrolyte.  
     
     
         9 . The nonaqueous electrolyte secondary battery according to  claim 1 , wherein the nonaqueous electrolyte contains γ-butyrolactone and sulfolane as the main solvents.  
     
     
         10 . The nonaqueous electrolyte secondary battery according to  claim 2 , wherein the nonaqueous electrolyte contains γ-butyrolactone and sulfolane as the main solvents.  
     
     
         11 . The nonaqueous electrolyte secondary battery according to  claim 3 , wherein the nonaqueous electrolyte contains γ-butyrolactone and sulfolane as the main solvents.  
     
     
         12 . The nonaqueous electrolyte secondary battery according to  claim 4 , wherein the nonaqueous electrolyte contains γ-butyrolactone and sulfolane as the main solvents.  
     
     
         13 . The nonaqueous electrolyte secondary battery according to  claim 5 , wherein the nonaqueous electrolyte contains γ-butyrolactone and sulfolane as the main solvents.  
     
     
         14 . The nonaqueous electrolyte secondary battery according to  claim 6 , wherein the nonaqueous electrolyte contains γ-butyrolactone and sulfolane as the main solvents.  
     
     
         15 . The nonaqueous electrolyte secondary battery according to  claim 7 , wherein the nonaqueous electrolyte contains γ-butyrolactone and sulfolane as the main solvents.  
     
     
         16 . The nonaqueous electrolyte secondary battery according to  claim 8 , wherein the nonaqueous electrolyte contains γ-butyrolactone and sulfolane as the main solvents.  
     
     
         17 . The nonaqueous electrolyte secondary battery according to  claim 1 , wherein the carbon material has a ratio ( I D /I G ) of a Raman spectrum intensity (R) obtained by Raman spectroscopy of 0.2 or greater.  
     
     
         18 . The nonaqueous electrolyte secondary battery according to  claim 2 , wherein the carbon material has a ratio (I D /I G ) of a Raman spectrum intensity (R) obtained by Raman spectroscopy of 0.2 or greater.  
     
     
         19 . The nonaqueous electrolyte secondary battery according to  claim 3 , wherein the carbon material has a ratio (I D /I G ) of a Raman spectrum intensity (R) obtained by Raman spectroscopy of 0.2 or greater.  
     
     
         20 . The nonaqueous electrolyte secondary battery according to  claim 5 , wherein the carbon material has a ratio (I D /I G ) of a Raman spectrum intensity (R) obtained by Raman spectroscopy of 0.2 or greater.